National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fog/Mist

76°F

24°C

Humidity 94%
Wind Speed S 6 mph
Barometer 29.96 in (1014.1 mb)
Dewpoint 74°F (23°C)
Visibility 4.00 mi
Heat Index76°F (24°C)
Last update 26 Jul 8:54 am CDT
Extended Forecast for

Decatur IL

Heat Advisory July 26, 12:00pm until July 27, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Partly sunny, with a high near 89. Heat index values as high as 103. South southeast wind around 7 mph becoming west southwest in the afternoon.

    High: 89 °F

    Partly Sunny

  • Tonight

    Tonight: A 10 percent chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 75. South southwest wind 5 to 7 mph.

    Low: 75 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 92. Heat index values as high as 106. South southeast wind 6 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.

    High: 92 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. South southwest wind 8 to 13 mph becoming west northwest after midnight. Winds could gust as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. North wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65. North northeast wind 5 to 9 mph, with gusts as high as 15 mph.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85. North northeast wind 5 to 9 mph.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 62.

    Low: 62 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

Detailed Forecast

Today
Partly sunny, with a high near 89. Heat index values as high as 103. South southeast wind around 7 mph becoming west southwest in the afternoon.
Tonight
A 10 percent chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 75. South southwest wind 5 to 7 mph.
Monday
Mostly sunny, with a high near 92. Heat index values as high as 106. South southeast wind 6 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Mostly clear, with a low around 75. South southwest wind 8 to 13 mph becoming west northwest after midnight. Winds could gust as high as 20 mph.
Tuesday
Mostly sunny, with a high near 89. North wind 8 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly clear, with a low around 65. North northeast wind 5 to 9 mph, with gusts as high as 15 mph.
Wednesday
Sunny, with a high near 85. North northeast wind 5 to 9 mph.
Wednesday Night
Clear, with a low around 62.
Thursday
Sunny, with a high near 86.
Thursday Night
Partly cloudy, with a low around 66.
Friday
A chance of showers. Partly sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
9:36 am CDT Jul 26, 2026
Forecast Valid:
9am CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation